Alternating-current electric motor.



J. T. SCHAAFP. ALTERNATING CURRENT ELBGTRI MOTOR. APPMGATION FILED MAR.s, 1906.

Patented Nov. 9, 1909.

JOHN T. scIIAAFr, or WASHINGTON, DISTRICT or COLUMBIA.

ALTERNATING-CURRENT ELECTRIC MOTOR.

Specification of Letters Patent.

Patented NOVI 9, 1909.

Appuati'on and March a, 190e. serial No. 305,090.

To all whom it may concern.:

Be it known that I, JOHN T. SCHAAFF, a

citizen of the United States, residing at Washington, in the District ofColumbia, have invented certain new and useful Improvements inAlternating-Current Electric Motors, of which the following is aspecification.

This motor comprises a plurality of elecl tromagnets having movablearmatures, a reciprocable memberA connected to the armatures, and meansfor retarding the phase of the current delivered to one magnet. Thephase-difference between the two magnets is preferably about ninetydegrees, so that the the moment of closing.

Referring to the accompanying drawings, Figure 1 is a plan view of themotor, the w1ring, key and hase-retarder being shown diagrammatical y;Fig. 2 is an axial section of one of the magnets on the line 2-2 of Fig.1; Fig. 3 is a transverse section of a magnet on the line 3-3 of Fig. 2;Fi 4 is a perspective view of the metal tu e on whlch the magnet-wire iswound; and Fig. 5 is a perspective view of the iron sleeve of a magnet.

The magnets 1, 2, are arranged with their axes parallel, their movablearmatures being pivotally connected to an oscillating frame 3.Alternating current is supplied by the line-wires 4, 5, the wire 6having branches 7, 8, which lead, to one end of the winding of the twomagnets. The su plywire 5 1s connected to a switch or keyever 9 whichmakescontact with a point 10, from which wires 11, 12 lead to the otherends of the magnet-windings. A phase-retarder 13 is interposed in thecircuit 12.

Each electromagnet com rises a soft-iron core 14 which is radially 'sotted, in a plane 15, to its axis, and a movable armature 16 which isalso radially slotted in a plane 17 to its axis. U on the core 14 is suported ha thin brass tu e 18 which is longitu inally slotted alongdiametrically'op osite lines 19, 20. The slot 19 exte'n'dsv near y tothe ends of the tube and two slots 20 extend inward from the ends of'thetube. These slots substantially prevent the circulation of eddycurrentsin the tube, while the uncut portions prevent the tube from collapsinunder the'pressure of the windin Upon t e ends of the tube 18 are mounteinsulatin disks 60 21, between which is the wire windlng 22. An ironsleeve 23, having longitudinal slots 24, 25 corresponding to those inthe brass tube and for the same purpose, surrounds the winding 22 and isin contact at one end 6,5 with the flange of the core 14, the other endbeing opposed to the flanged end of the armature 16. 1

The oscillating frame 3 comprises a rockshaft 26 having journals 27,parallel lateral 70 arms 28 and a cross-piece 29. To each of the outerarms 28 is pivoted, by a screw 30,

a link 31 which is adjustably threaded into an axial bore in amagnet-armature.

The phase retarder 13 may be of any usual 75 or preferredconstruction.That shown comprises an inductance 32 in the form of a` corelesssolenoid, and a condenser 33 parallel thereto. These elements arepreferably proportioned to cause the phase of the current supplied tothe magnet 2 tov lag about ninety degrees behind that supplied to themagnet 1, the result being that current at substantially the full linepressure is always supplied to one of the ma nets when the key` 9 isclosed, whatever the p ase of the current in the line wires.

Motors of this construction may be used on three or otherolyphase-current circuits, the number of e ectromagnets then correvsponding to the number of phases and each magnet but one being suppliedwith a suitable phase-retarder, so that the several magnets areenergized in succession. The armatures ofthe magnets may be rigidlyconnected together, or be parts of a single member, for example a bar,which may itself constitute the reciprocable member of the motor, itbeing immaterial `whether' the reciprocation of the driven member is ina right line or an arc.

The motor is applicable to a variety lof uses, such as the actuating ofcash registers, adding machines, typewrlting machines and punchesfor prearing the paper stencils for typesetting mac ines.

I claim 1. An alternating-current electric motor, comprising a pluralityof separate electromagnets, spaced a art, a singlearmaturedo memberreciprocab e in the same direction,y

by both magnets, a .source of alternatingl electric current conne and aphase magnet.

2. An alternatin comprising a plur magnets compris single a samedirection by bot alternating electri both ma circuit o 3. An alternatlncomprising a plur magnets, spaced apart, each electr comprising aslotted metal cor armature, a sin rocable in the nets, a source cted toboth magnets, connected to both magnets, and a. phase-re- -retarder inthe circuit of one tarder in the circuit of one ma net.

4. A n alternating-current ke ectric motor,

g-current electric motor, I comprising a plurality of separateelectroality of separate electromagnets, spaced apart, eachelectromagnet spaced apart, each electromagnet comprising a tubularmetal member slotted lng a slotted core and armature, a longltudinallyat two points, a single armarmature member reciprocable in the turemember reciprocable in the same dih magnets, a source of rection by bothmagnets, a source of alterc current connected to nating electric currentconnected to both nets, and a phase-retarder in the magnets, and aphase-retarder in the circuit of one magnet.

g-'current electric motor, Intestimony whereof, I aflix my signaallty ofseparate electroture in presence of two witnesses.

omagnet e, shell and JOHN T' SCHAAFF gle armature memberrecipyWitnesses: same directlon by both magof alternating electriccurrent C. W. FOWLER, EUGENE A. BYRNES.

